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What is meant by galvanisation? Why is i...

What is meant by galvanisation? Why is it done?

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LAKHMIR SINGH & MANJIT KAUR-METALS AND NON-METALS-Exercise
  1. What chemical process is used for obtaining a metal from its oxide?

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  2. State two ways to prevent the rusting of iron.

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  3. What is meant by galvanisation? Why is it done?

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  4. Name the metal which is used for galvanising iron.

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  5. Explain why,iron sheets are coatedwith zinc.

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  6. Why do we apply paint on iron articles?

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  7. Give reason for the following: Carbonate and sulphide ores are usual...

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  8. Name a reducing agent that may be used to obtain manganese from mangan...

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  9. Name an alloy of lead and tin.

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  10. Give the composition of an alloy called solder. State its one property...

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  11. what is an amalgam?

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  12. How many carats is pure gold ? Why is pure gold not suitable for makin...

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  13. Name one method for the refining of metals.

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  14. State two conditions for the rusting of iron.

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  15. In one method of rust prevention, the iron is not coated with anything...

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  16. Name two allys ofiron.what elements are present in these alloys?

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  17. Give reason for the following: Silver, gold and platinum are used to...

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  18. Which metal becomes black in the presence of hydrogen sulphide gas in ...

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  19. name the gas in air which tarnishes silver articles slowly.

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  20. Silver metal does not combine easily with oxygen but silver jewellery ...

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